Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a fragmentary enlarged front view showing the details of the tread portion thereof;

FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 5; and,

FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 5.

The broken lines are used to show portions of the tread portion of an automobile tire that are not being claimed, and thus form no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 